<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许位第三级分类神经相关参数"
        type="warning"
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="{
              expandTrigger: 'hover',
              ...cateProps,
            }"
            @change="handleChange"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- 添加参数按钮区域 -->
      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="small"
            :disabled="isBtnDisabled"
            @click="addParamsDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table
            :data="manyTableDate"
            border
            stripe
            width="100%"
            v-if="activeName === 'many'"
          >
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-row class="el-row1">
                  <!-- 循环渲染Tag标签 -->
                  <el-tag
                    v-for="(item, i) in scope.row.attr_vals"
                    :key="i"
                    closable
                    @close="handleClose(i, scope.row)"
                  >
                    {{ item }}
                  </el-tag>
                  <!-- 输入的文本框 -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button
                    v-else
                    class="button-new-tag"
                    size="small"
                    @click="showInput(scope.row)"
                    >+ New Tag</el-button
                  >
                </el-row>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"> </el-table-column>
            <el-table-column prop="attr_name" label="参数名称">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <!-- 修改按钮 -->
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="small"
                  @click="showParamsEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <!-- 删除按钮 -->
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="small"
                  @click="removeParamsById(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            size="small"
            :disabled="isBtnDisabled"
            @click="addParamsDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table
            :data="onlyTableDate"
            border
            stripe
            width="100%"
            v-if="activeName === 'only'"
          >
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-row class="el-row1">
                  <!-- 循环渲染Tag标签 -->
                  <el-tag
                    v-for="(item, i) in scope.row.attr_vals"
                    :key="i"
                    closable
                    @close="handleClose(i, scope.row)"
                  >
                    {{ item }}
                  </el-tag>
                  <!-- 输入的文本框 -->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <!-- 添加按钮 -->
                  <el-button
                    v-else
                    class="button-new-tag"
                    size="small"
                    @click="showInput(scope.row)"
                    >+ New Tag</el-button
                  >
                </el-row>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"> </el-table-column>
            <el-table-column prop="attr_name" label="属性名称">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <!-- 修改按钮 -->
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="small"
                  @click="showParamsEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <!-- 删除按钮 -->
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="small"
                  @click="removeParamsById(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addParamsDialogVisible"
      width="50%"
      @close="addParamsDialogClosed"
      :close-on-click-modal="false"
    >
      <!-- 内容主体区域 -->
      <el-form
        :model="addParamsForm"
        :rules="ParamsFormRules"
        ref="addParamsFormRef"
        label-width="70px"
      >
        <el-form-item :label="titleText" prop="attr_name" label-width="90px">
          <el-input v-model="addParamsForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addParamsDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="editParamsDialogVisible"
      width="50%"
      @close="editParamsDialogClosed"
      :close-on-click-modal="false"
    >
      <!-- 内容主体区域 -->
      <el-form
        :model="editParamsForm"
        :rules="ParamsFormRules"
        ref="editParamsFormRef"
        label-width="70px"
      >
        <el-form-item :label="titleText" prop="attr_name" label-width="90px">
          <el-input v-model="editParamsForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editParamsDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default
  {
    data() {
      return {
        // 商品分类列表
        catelist: [],
        cateProps: {
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
        },
        // 级联选择框双向绑定的数组
        selectedCateKeys: [],
        // 被激活的页面的名称
        activeName: 'many',
        // 动态参数的数据
        manyTableDate: [],
        // 静态属性的数据
        onlyTableDate: [],
        // 控制添加参数对话框的显示和隐藏
        addParamsDialogVisible: false,
        // 添加参数的表单数据对象
        addParamsForm: {
          attr_name: ''
        },
        // 表单验证对象
        ParamsFormRules: {
          attr_name: [
            { required: true, message: '请输入名称', trigger: 'blur' }
          ],
        },
        // 控制修改参数对话框的显示和隐藏
        editParamsDialogVisible: false,
        // 修改参数的表单数据对象
        editParamsForm: {},
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      // 获取所有的商品分类列表
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类失败！')
        }
        this.catelist = res.data
        // console.log(this.catelist);
      },

      // 级联选择框选中项变化，会触发整个函数
      async handleChange() {
        // console.log(this.selectedCateKeys);
        this.getParamsData()
      },

      //   tab 页签点击事件的处理函数
      handleTabClick() {
        // console.log(this.activeName);
        this.getParamsData()
      },

      //   获取参数的列表数据
      async getParamsData() {
        // 证明选中的不是三级分类
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = [],
            this.manyTableDate = [],
            this.onlyTableDate = []
          return
        }
        // 证明选中的是三级分类
        // 根据所选分类的Id,和当前所处的面板，获取对应的参数
        const { data: res } = await this.$http.get
          (`categories/${this.cateId}/attributes`,
            { params: { sel: this.activeName } }
          )
        // 把字符串循环 改变成数组
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 控制文本框的显示与隐藏
          item.inputVisible = false
          // 文本框中输入的值
          item.inputValue = ''

        })
        // console.log(res.data);
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数失败！')
        }
        // console.log(res.data);
        if (this.activeName === 'many') {
          this.manyTableDate = res.data
        } else {
          this.onlyTableDate = res.data
        }
      },

      // 监听添加对话框的关闭事件,重置表单
      addParamsDialogClosed() {
        this.$refs.addParamsFormRef.resetFields()
      },
      // 点击按钮添加函数
      addParams() {
        this.$refs.addParamsFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
            {
              attr_name: this.addParamsForm.attr_name,
              attr_sel: this.activeName
            })
          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败！')
          }
          this.$message.success('添加参数成功！')
          this.addParamsDialogVisible = false
          this.getParamsData()

        })
      },

      // 点击按钮，展示修改的对话框
      async showParamsEditDialog(attr_id) {
        // 查询当前参数的信息
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes/${attr_id}`,
          {
            params: { attr_sel: this.activeName }
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败！')
        }

        this.editParamsForm = res.data
        this.editParamsDialogVisible = true
      },

      // 监听修改对话框的关闭事件,重置表单
      editParamsDialogClosed() {
        this.$refs.editParamsFormRef.resetFields()
      },
      // 点击按钮修改函数
      editParams() {
        this.$refs.editParamsFormRef.validate(async valid => {
          const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editParamsForm.attr_id}`,
            {
              attr_name: this.editParamsForm.attr_name,
              attr_sel: this.activeName
            })
          if (res.meta.status !== 200) {
            return $message.error('修改参数失败！')
          }
          this.$message.success('修改参数成功！')
          this.getParamsData()
          this.editParamsDialogVisible = false
        })
      },

      // 根据ID删除对应的参数
      async removeParamsById(attr_id) {
        const confirmResult = await this.$confirm('此操作将永久删除该权限数据, 是否继续?', '提示',
          {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }
          // 如果角色取消了删除，则返回值为字符串 cancel
        ).catch(err => err)

        // 如果角色确认删除，则返回值为字符串 confirm
        // console.log(confirmResult)
        if (confirmResult !== 'confirm') {
          return this.$message.info('已取消删除')
        }
        const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败！')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
      },
      // 文本框失去焦点，或摁下了Enter都会触发
      async handleInputConfirm(row) {
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        // 如果没有return，则证明输入的内容，需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        // 需要发起请求，保存这次操作
        this.saveAttrVals(row)
      },
      // 将对 attr_vals 的操作，保存到数据库
      async saveAttrVals(row) {
        // 需要发起请求，保存这次操作
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${row.attr_id}`,
          {
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' ')
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('修改参数项失败！')
        }

        this.$message.success('修改参数项成功！')
      },
      // 点击按钮，展示文本输入框
      showInput(row) {
        row.inputVisible = true
        // 让文本框自动获得焦点
        // $nextTick 方法的作用，就是当页面上元苏被重新渲染之后，才会指定回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });

      },
      // 删除对应的参数可选项
      handleClose(i, row) {
        row.attr_vals.splice(i, 1)
        this.saveAttrVals(row)
      },
    },
    // 计算属性
    computed: {
      // 如果按钮需要被禁用，则返回true，否则返回false
      isBtnDisabled() {
        // 三元表达式
        return this.selectedCateKeys.length !== 3
      },
      // 当前选中的三级分类的ID
      cateId() {
        return this.selectedCateKeys.length === 3 ?
          this.selectedCateKeys[2] : null
      },
      titleText() {
        return this.activeName === 'many' ? '动态属性' : '静态属性'
      },
    }
  }
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.el-cascader {
  width: 23%;
}

.input-new-tag {
  width: 200px;
}
</style>>